Hi Jim,
Happy new year !
I don't know if it helps but my 2B had a pinto with an aluminium rad. which I piped up with hoses from CBS
IIRC I used a "wriggly" https://www.carbuilder.com/uk/32mm-wiggly-rubber-hose (plus a 90 bend from the engine end) for the bottom, and a "flexible" https://www.carbuilder.com/uk/vulcoflex-flexible-hoses for the top.
Someone with a 3A may know of better options.
Steve